Effects of Surface Roughness, Load and Sliding Speed on the Tribological Behavior of Dry Rubber–Granite ContactsPages 297-306
Ionut Marius Nazarie Abstract:
This study investigates dry rubber–granite sliding contact under low normal loads and low sliding speeds. Friction coefficients were measured using an MFT2000 tribometer for three normal load levels and ten sliding speeds, considering two different surface roughness conditions. Surface microtopography was characterized using MarSurf CM 3D optical microscopy. The results demonstrate that surface microtopography plays a dominant role in this regime, leading to relatively high friction coefficient values. The friction response is governed by the coupled effects of normal load, sliding velocity, and roughness characteristics. An increase in sliding speed results in higher friction coefficients, followed by a tendency toward stabilization at higher velocities. A quantitative analysis of the experimental data, based on the standard deviation of repeated measurements, reveals an increasing dispersion of friction values with both load and speed. This behavior highlights the growing influence of viscoelastic deformation and micro-asperity interactions and indicates a transition from adhesion-dominated contact at low speeds to a regime increasingly controlled by hysteresis effects. The study provides an interpretation of friction mechanisms in low-speed elastomeric contacts, contributing to a better understanding of rubber–surface interaction under dry conditions.
Keywords: Dry friction,
Rubber,
Granite,
Surface roughness,
Sliding velocity
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